Hugh O'Brian, Mickey Rooney, and James Mitchum star as three Marines on a secret mission in this 1966 nail-biter, set on the Japanese-controlled island of Siarago during World War II. They arrive on the island hoping to find a Japanese-American girl with vital information concerning General Douglas MacArthur's pending Philippine invasion. Instead they uncover a Japanese plot to detonate underwater mines as the U.S. fleet enters the bay. Cut off from outside communication, the three must find a way to prevent the impending military disaster.